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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한이비인후과학회 부산,울산,경남 지부회 임상이비인후과 임상이비인후과 제30권 제2호
발행연도
2019.1
수록면
189 - 198 (10page)

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Background and Objectives:Several studies have demonstrated that tinnitus subjects show significantly re- duced sound level tolerance compared with control subjects, but they did not separate into groups with unilat- eral and bilateral tinnitus in the analyses. To investigate the influence of tinnitus on sound level tolerance, we compared uncomfortable loudness level (UCL) among tinnitus ears (TEs) and non-tinnitus ears (NTEs) of unilateral tinnitus subjects and control ears of normal subjects. Moreover, we compared UCL between tinnitus subjects who complained hyperacusis and those who did not. Materials and Methods:Human subjects in- cluded 50 unilateral tinnitus subjects (12 males and 38 females) with normal and symmetric hearing thresh- olds and 64 control subjects. We conducted psychoacoustic measurements of UCLs with 500 Hz and 3,000 Hz pure tones in each ear separately. Results:The There were no significant differences of UCLs at 500Hz and 3,000 Hz of between TEs and NTEs, but the UCLs at 500 Hz and 3,000 Hz of both TEs and NTEs were lower than those of the control ears. No significant differences of UCLs at 500 Hz and 3,000 Hz were found between tinnitus subjects with hyperacusis and without hyperacusis. The UCL of 500 Hz had significantly negative correlation with the duration of tinnitus and subjective tinnitus loudness. Conclusions:These results support the existing hypothesis that tinnitus and hyperacusis are commonly caused by an increase of central gain. Re- duced sound level tolerance in not only TEs but also NTEs might imply that the increased central gain affects bilaterally in consequence of loudness balance mechanism by lateral olivocochlear efferents.

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